I had a good time playing your game :)
I particularly like the before/after corruption on each zone.
In my opinion the bullet physics could be improved to have a real bullet-hell. I feel like you added the player speed to bullets on spawn or something, I am not sure if it is a good idea or not, it seemed like bullets were not going exactly were I had aimed. Also maybe it could be good for bullets to be quicker.
Like it is now, I did not fire a single bullet after second zone since I could not target anything properly and enemies were not a big threat while I was running in circle haha.
Also, there should be a hint somewhere about the double jump, necessary to leave the pyramid haha
But overall nice game ! :)